This document summarizes Flammant's solution for determining stress in a half-space due to a line load. It discusses how Flammant used Boussinesq's solution and superposition to calculate the normal stress component σzz at a point A. The line load is treated as a sequence of infinitesimal point loads. Integrating the stress increment dσzz due to each point load from -∞ to ∞ gives the total stress σzz. Flammant's solution shows that the maximum principal stress occurs on circles centered along the load axis, with the circle radius increasing with decreasing stress.
STABILITY OF SLOPESSEEPAGE CONTROL MEASURES AND SLOPE PROTECTION
a finite slope AB, the stability of which is to be analyzed.
The method Consists of assuming a number of trial slip circles, and finding the factor of safety of each.
The circle corresponding to the minimum factor of safely is the critical slip circle.
Let AD be a trial slip circle, with r as the radius and O as the centre of rotation
Let W be the weight of the soil of the wedge ABDA of unit thickness, acting through the centroid G.
The driving moment MD will be equal to W x, where x, is the distance of line of action of W from the vertical line passing through the centre of rotation O.
if cu is the unit cohesion, and l is the length of the slip arc AD, the shear resistance developed along the slip surface will be equal to cu • l, which act at a radial distance r from centre of rotation O.
When slip is imminent in a cohesive soil, a tension crack will always DevelOP by the top surface of the slope along which no shear resistance can develop,
The depth of tension crack is given by
The effect of tension crack is to shorten the arc length along which shear resistance gets mobilised to AB' and to reduce the angle δ to δ'.
The length of the slip arc to be taken in the computation of resisting force is only AB', since tension crack break the continuity at B'.
The weight of the sliding wedge is weight of the area bounded by the ground surface, slip circle arc AB' and the tension crack.
STABILITY OF SLOPESSEEPAGE CONTROL MEASURES AND SLOPE PROTECTION
a finite slope AB, the stability of which is to be analyzed.
The method Consists of assuming a number of trial slip circles, and finding the factor of safety of each.
The circle corresponding to the minimum factor of safely is the critical slip circle.
Let AD be a trial slip circle, with r as the radius and O as the centre of rotation
Let W be the weight of the soil of the wedge ABDA of unit thickness, acting through the centroid G.
The driving moment MD will be equal to W x, where x, is the distance of line of action of W from the vertical line passing through the centre of rotation O.
if cu is the unit cohesion, and l is the length of the slip arc AD, the shear resistance developed along the slip surface will be equal to cu • l, which act at a radial distance r from centre of rotation O.
When slip is imminent in a cohesive soil, a tension crack will always DevelOP by the top surface of the slope along which no shear resistance can develop,
The depth of tension crack is given by
The effect of tension crack is to shorten the arc length along which shear resistance gets mobilised to AB' and to reduce the angle δ to δ'.
The length of the slip arc to be taken in the computation of resisting force is only AB', since tension crack break the continuity at B'.
The weight of the sliding wedge is weight of the area bounded by the ground surface, slip circle arc AB' and the tension crack.
Momentum flux in the electromagnetic fieldSergio Prats
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Liquid limit is the water content where the soil starts to behave as a liquid. Liquid limit is measured by placing a clay sample in a standard cup and making a separation (groove) using a spatula. The cup is dropped till the separation vanishes. The water content of the soil is obtained from this sample.
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Terzaghi's soil bearing capacity theory, developed by Karl Terzaghi, is a fundamental principle in geotechnical engineering used to determine the bearing capacity of shallow foundations. This theory provides a method to calculate the ultimate bearing capacity of soil, which is the maximum load per unit area that the soil can support without undergoing shear failure. The Calculation HTML Code included.
Democratizing Fuzzing at Scale by Abhishek Aryaabh.arya
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Overview of the fundamental roles in Hydropower generation and the components involved in wider Electrical Engineering.
This paper presents the design and construction of hydroelectric dams from the hydrologist’s survey of the valley before construction, all aspects and involved disciplines, fluid dynamics, structural engineering, generation and mains frequency regulation to the very transmission of power through the network in the United Kingdom.
Author: Robbie Edward Sayers
Collaborators and co editors: Charlie Sims and Connor Healey.
(C) 2024 Robbie E. Sayers
Immunizing Image Classifiers Against Localized Adversary Attacksgerogepatton
This paper addresses the vulnerability of deep learning models, particularly convolutional neural networks
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introduce a novel volumization algorithm, which transforms 2D images into 3D volumetric representations.
When combined with 3D convolution and deep curriculum learning optimization (CLO), itsignificantly improves
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accuracy improvements over previous techniques. The results indicate that the combination of the volumetric
input and curriculum learning holds significant promise for mitigating adversarial attacks without necessitating
adversary training.
Forklift Classes Overview by Intella PartsIntella Parts
Discover the different forklift classes and their specific applications. Learn how to choose the right forklift for your needs to ensure safety, efficiency, and compliance in your operations.
For more technical information, visit our website https://intellaparts.com
Explore the innovative world of trenchless pipe repair with our comprehensive guide, "The Benefits and Techniques of Trenchless Pipe Repair." This document delves into the modern methods of repairing underground pipes without the need for extensive excavation, highlighting the numerous advantages and the latest techniques used in the industry.
Learn about the cost savings, reduced environmental impact, and minimal disruption associated with trenchless technology. Discover detailed explanations of popular techniques such as pipe bursting, cured-in-place pipe (CIPP) lining, and directional drilling. Understand how these methods can be applied to various types of infrastructure, from residential plumbing to large-scale municipal systems.
Ideal for homeowners, contractors, engineers, and anyone interested in modern plumbing solutions, this guide provides valuable insights into why trenchless pipe repair is becoming the preferred choice for pipe rehabilitation. Stay informed about the latest advancements and best practices in the field.
TECHNICAL TRAINING MANUAL GENERAL FAMILIARIZATION COURSEDuvanRamosGarzon1
AIRCRAFT GENERAL
The Single Aisle is the most advanced family aircraft in service today, with fly-by-wire flight controls.
The A318, A319, A320 and A321 are twin-engine subsonic medium range aircraft.
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COLLEGE BUS MANAGEMENT SYSTEM PROJECT REPORT.pdfKamal Acharya
The College Bus Management system is completely developed by Visual Basic .NET Version. The application is connect with most secured database language MS SQL Server. The application is develop by using best combination of front-end and back-end languages. The application is totally design like flat user interface. This flat user interface is more attractive user interface in 2017. The application is gives more important to the system functionality. The application is to manage the student’s details, driver’s details, bus details, bus route details, bus fees details and more. The application has only one unit for admin. The admin can manage the entire application. The admin can login into the application by using username and password of the admin. The application is develop for big and small colleges. It is more user friendly for non-computer person. Even they can easily learn how to manage the application within hours. The application is more secure by the admin. The system will give an effective output for the VB.Net and SQL Server given as input to the system. The compiled java program given as input to the system, after scanning the program will generate different reports. The application generates the report for users. The admin can view and download the report of the data. The application deliver the excel format reports. Because, excel formatted reports is very easy to understand the income and expense of the college bus. This application is mainly develop for windows operating system users. In 2017, 73% of people enterprises are using windows operating system. So the application will easily install for all the windows operating system users. The application-developed size is very low. The application consumes very low space in disk. Therefore, the user can allocate very minimum local disk space for this application.
Quality defects in TMT Bars, Possible causes and Potential Solutions.PrashantGoswami42
Maintaining high-quality standards in the production of TMT bars is crucial for ensuring structural integrity in construction. Addressing common defects through careful monitoring, standardized processes, and advanced technology can significantly improve the quality of TMT bars. Continuous training and adherence to quality control measures will also play a pivotal role in minimizing these defects.
2. POINT LOAD
Point load have a finite force acting on a surface of zero area.
LINE LOAD
Line load acts on an infinitely long line rather than a point.
3. Consider a line load acting on a surface of a halfspace.
4. Flammant used Boussinesq solution along with principle of
superposition to solve for stress field in halfspace with line load.
Consider point A in the figure.
Since the load is acting on the Y axis from infinity to infinity, we can
have origin at any point on Y axis.
We will try to find out the σzz component of stress at point A due to
line load.
6. For any point inside the halfspace, including A, the line load ρ
acting on the element dy looks like a point load.
There will be increment of stress dσzz caused by this point load ρdy.
dσzz is given by Boussinesq solution.
7. Now to find stress σzz, we have to integrate both sides
As the line load varies from -∞ to ∞
8. From the figure
b = (x2+z2)
1/2
y = (b tanØ)
dy = b sec2Ø
We can rewrite as
9. We can find other components of stress similarly
10. The line load is effectively a sequence of point loads side by side and we are using
superposition to derive σzz.
This is possible only when we consider linear elastic theory.
Flamants solution is one of the applications of Boussinesq solution.
It is an example of plain strain problem.
Plain strain problems have 1 spatial direction in which only rigid motions occur.
As a result certain strain will be identically zero.
Non zero strain functions are not functions of y.
A particle, that initially has coordinate y0 in reference configuration will always have
coordinate y0 in any deformed plane; unless and otherwise a rigid translation in the
y direction occurs.
11. Now let us consider a cylindrical surface of radius b alligned with line load.
We could carry out an analysis to find tractions that act on this surface by using
above equations.
After doing analysis we find traction vector
where n is the unit normal vector to the cylindrical surface
12. What this means is cylindrical surface itself is a principal surface.
The major principal stress
The intermediate principal surface is defined by vector n = [0,1,0]
The intermediate principal stress
The minor principal surface is perpendicular to the cylindrical surface and to the
intermediate principal surface.
Minor principal stress = 0
13. When the vertical component of the traction is integrated along the cylindrical
surface, it equilibriates the applied load ρ.
Another interesting characteristic of Flammant’s problem is the distribution of the
principal stress in space.
Consider the locus of points on which major principal stress σ1 is constant.
It is an equation of a circle with centre on z axis at a depth c beyond the origin and
radius as c.
14.
15. At each point on this circle σ1 is constant.
It points directly at origin.
If we consider larger value for c, circle will be larger as c ∞ (1/ σ1).
This result gives the pressure bulb in the soil beneath the
foundation.
It is helpfull in visualizing stress fields.